First principles study of transport properties of LaAlO3/ SrTiO3heterostructure with water adsorbates

W. C. Lo, Kit Au, N. Y. Chan, Haitao Huang, Chi Hang Lam, Jiyan Dai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


Tuning transport properties of two-dimensional electron gas (2DEG) at the LaAlO3/SrTiO3interface by surface modification is of great interest due to its rich physics and potential application in polar liquid or gas sensors. From first-principle calculations, we found that the adsorption of a thin layer of polar water molecules on the surface of LaAlO3can remarkably enhance the carrier density of the interfacial 2DEG by over at least 50% which is qualitatively consistent with reported experimental result. This result sheds light on the charge coupling between surface polar molecules and interfacial 2DEG and suggests that sensor devices may be built using the hetero-oxide interfacial 2DEG.
Original languageEnglish
Pages (from-to)46-49
Number of pages4
JournalSolid State Communications
Publication statusPublished - 1 Jan 2013


  • Interface
  • Polar molecule sensor
  • Two-dimensional electron gas

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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